General Description
The MAX6467/MAX6468 microprocessor (µP) supervisory
circuits monitor single power-supply voltages from +1.8V
to +5.0V and assert a reset if the supply voltage drops
below its preset threshold. An edge-triggered, one-shot
manual reset function ensures that the µP enters the reset
mode for a fixed timeout period only, even in the event
of a continuously asserted manual reset. The MAX6467/
MAX6468 significantly improve system reliability compared
to traditional manual reset supervisory circuits.
A variety of factory-trimmed threshold options accommodate
different supply voltages and tolerances, eliminating
external components. The factory-set thresholds range
from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V,
+2.5V, and +1.8V supplies with various tolerances. Reset
timeout periods of 150ms (min) and 1200ms (min) are
available to accommodate different µP platforms.
A single, active-low RESET output asserts when VCC
drops below its threshold or if the edge-triggered MR
asserts low. RESET remains low for the reset time-
out period after VCC rises above its threshold and for
a fixed, one-shot timeout period after a manual reset
input falling edge. RESET remains valid as long as VCC
remains above +1V. Open-drain (MAX6467) and push-
pull (MAX6468) output options provide additional flexibility
in the system design.
The MAX6467/MAX6468 are offered in the space-saving
4-pin SOT143 package and the ultra-small 4-pin SC70
package and are specified over the automotive (-40°C to
+125°C) temperature range.
Applications
●Cell Phones/PDAs
●Embedded Control Systems
●Industrial Equipment
●Automotive Products
●Portable/Battery-Powered Equipment
●Medical Devices
●DSL Modems
●MP3 Players
●GPS Systems
●Digital Cameras
Features
●Precision Factory-Set Reset Threshold Voltages for
+5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies
●Edge-Triggered Manual Reset Input with One-Shot
Pulsed Reset Output
●Two Reset Timeout Period Options (150ms or
1200ms min)
●Immune to Short Voltage Transients
●Low Supply Current (3µA at VCC = +1.8V)
●RESET Valid to VCC = +1V
●Active-Low Open-Drain and Push-Pull RESET
Output Options
●-40°C to +125°C Operating Temperature Range
●Small 4-Pin SC70 and SOT143 Packages
●No External Components Required
●Pin Compatible with MAX811, MAX6315, MAX6384,
and MAX6386
Ordering Information appears at end of data sheet.
MAX6467
MAX6468
+1.0V TO +5.5V
VCC
GND
VCC
GND
MR RESET RESET
INPUT
µP
Typical Operating Circuit
MAX6467/MAX6468 Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
19-2523; Rev 5; 10/15